Xylem MJK 1100, MJK2100, MJK3100 User Manual

Manual

Manual

MJK 1100 / 2100 / 3100
Submersible Hydrostatic Level Transmitters

M275US0205

As our products are developed continuously we reserve the right to make any
change in the dimensions and the specifications.

MJK Automation A/S

Byageren 7
DK-2850 Nærum
Denmark
Tel.: [phone]
Fax: [phone]
[e-mail]
www.mjk.com

Manual

General

Safety instructions 1: Read this manual carefully.

Product identification and
pressure ranges

Model 1100
Nominal pressure

range 0 - 10 ft,
0 - 30 ft, 0 - 100 ft.
Other ranges
available; see data
sheet.

Level measuring with a pressure transmitter
is done by immersing a transmitter in the
liquid. The transmitter measures the
hydrostatic pressure and generates a
current signal that is proportional with the
hydrostatic pressure and thus proportional
with the liquid level.

2: Be aware of the environment on the

installation site. Wear neseccary protec­tive equipment and follow all current
safety regulations.

It is very important for the overall measuring
accuracy that the pressure transmitter has
the correct pressure range.
Check that the item(s) delivered corresponds
to the ordered item(s) by means of the
information on the label on the packing:

Model 2100
Nominal pressure

range 0 - 10 ft,
0 - 30 ft, 0 - 100 ft.
Other ranges
available; see data
sheet.

The MJK Submersible Hydrostatic Level
Transmitters are all designed to generate
a 2-wire (passive) 4 - 20 mA signal with a
10 - 30 V DC supply.

3: MJK Pressure Transmitters must not be

used in explosion hazarduous areas.

4: MJK Pressure Transmitters must not be

submerged into flammable liquids.

On the model 1100 transmitter, all the
standard pressure ranges together with the
corresponding order numbers are printed on
a label on the transmitter housing. The
pressure range can be determined by
comparing the order number impressed in
the steel housing (together with the serial
number) with the numbers on the label.

Model 3100
Nominal pressure

range 0 - 1 ft,
0 - 3 ft, 0 - 10 ft.
Other ranges
available; see data
sheet.

M275US0205

Shown below is the label for a model 1100
pressure transmitter, range 0-10 ft:

➀➀

➀

➀➀
➁➁

➁

➁➁

➂➂

➂

➂➂
➃➃

➃

➃➃

➀➀

➀ Item number

➀➀
➁➁

➁ Item description

➁➁

The same information plus cable length is
printed on a similar label tagged onto the
transmitter cable.

➂➂

➂ Pressure range

➂➂
➃➃

➃ Serial number

➃➃

On model 2100 and 3100 transmitters, the
actual pressure range is ticked off on the
label on the housing.

For all verstions the pressure range can be
determined through the serial number.

MJK Automation A/S

Byageren 7
DK-2850 Nærum
Denmark
Tel.: [phone]
Fax: [phone]
[e-mail]
www.mjk.com

Manual

Mechanical mounting,
Model 1100

Model 2100

1: Mount a suitable hook over the desired

measuring location. Note the weight of
the cable.

2: Remove the inner conical sleeve from

the cable fitting and pull the cable
through the outer part. Open the inner
sleeve and fit it around the cable at the
desired fixation point and press the
inner sleeve into place in the outer part.
Secure the cable fitting by pulling the
cable downwards.

3: Lower the pressure transmitter into the

wellpipe. Take care not to hit the

bottom hard since it may damage the
transmitter!

1: Mount a suitable hook over the desired

measuring location. Note the weight of
the cable.

2: Mount the cable fitting onto the cable.

Open the fitting by sliding the two plastic
jaws upwards, place the cable between
the jaws and slide the jaws downwards
until the cable locks. Secure the cable
fitting by pulling the cable downwards.

3: Lower the pressure transmitter into the liquid.

Take care not to hit the bottom hard since it
may damage the transmitter!

4: If the transmitter is to be used in a

wetwell or other locations with
turbulence or other disturbance, it is
advisable to install a pipe (min. nominal
diameter = 3 in) to protect the trans­mitter from bumping into the wall or
other components. It is very important

that minimum 1 in of the pressure
transmitter is not being covered by
the pipe!

Cable fitting

Cable fitting

Protective pipe

Min. nominal

dimension = 3 in.

Min. 1 - 2 in !

Model 1100

Model 2100

Model 3100

M275US0205

1: Mount the pressure transmitter onto a 1

in pipe (1” NPT thread) and mount the
pipe firmly at the desired measuring
location.

2: Lower the pressure transmitter into the

liquid. Take care not to hit the bottom

hard since it may damage the transmit­ter!

1 in NPT thread

Model 3100

MJK Automation A/S

Byageren 7
DK-2850 Nærum
Denmark
Tel.: [phone]
Fax: [phone]
[e-mail]
www.mjk.com

Manual

Electrical mounting The pressure transmitters are delivered with

39 ft of cable as standard (except 209940
and 209960: 120 ft).
The cable can be lengthened with any type
of cable using connection box 202922.
Although the measuring signal is not sen­sitive to electrical noise, we recommend
the use of a screened cable.

Ensure that no moisture can enter the
pressure compensation tube inside the cable.

The length of the cable is only limited by
the total resistance (A) of the cable wires +
the input impedance of the analog input on
the MJK 704, MJK 713, PLC etc. (typically 10
to 100 Ω) and the available supply voltage
(B) (typically 24 V DC).

Example:

The nominal resistance for 1 wire in a
transmitter cable is 0.011

ΩΩ

Ω/ft. A standard

ΩΩ

39 ft cable will therefore add 2 x 0.011 x 39 =

Designation of wires,
cutting & stripping the
cable

The factory delivered cable has the wires
marked with the numbers 1 - 2 - 3 as to
the table to the right. If the cable needs to
be cutted and stripped, the shield should
be connected as the no. 3 wire.
Do NOT connect any of the colored program­ming wires as it may damage the transmit­ter. The programming wires should be cut off
in different lengths to prevent them from short
circuit. Take care not to block or squeeze

the air pressure compensation tube

➃➃

➃.

➃➃

ΩΩ

0.86

Ω to the loop resistance. If the analog

ΩΩ

input has an impedance of 50 Ω, the total
resistance will be approx. 51

ΩΩ

Ω.

ΩΩ

According to the diagram below, approx.
12 V DC will be sufficient.

Necessary supply voltage in relation to

the total loop resistance.

]

Ω

Total loop resistance [

(A)

(B) Supply voltage [V DC]

Wire designation:
1: Positive (+) wire
2: Negative (-) wire
3: Shield

(NOT signal
ground!)

4: Air pressure

compensation
tube

5: Programming

wires

➃➂

➁

➀

Factory delivery. Cutted and stripped.

➁

➃

➀

➄

➂

Cable connection

M275US0205

Analog input on 704, PLC etc.

Power
supply

(10 - 30

V DC)

Analog

input

Shield

➂

(NOT signal
ground!)

Positive (+)

➀

wire

➀

➁

Negative (-)
wire

MJK Connection Box (NEMA 4X) with

vent plug, order no. 202922.

➀➁➂➀➁➂

To ULC,
PLC etc.

MJK type 531 Field Indicator, order no.

200126 (option, replaces lid for connection

box). See separate data sheet.

From pressure transmitter

MJK Automation A/S

Byageren 7
DK-2850 Nærum
Denmark
Tel.: [phone]
Fax: [phone]
[e-mail]
www.mjk.com